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In the below diagrams, A and B are initial areas of leaves. A' and B' are areas of leaves after growth. Which of the following is correct?
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Absolute growth is different, but relative growth is the same
Quantitative comparisons between the growth of a living system can also be made in two ways: (i) measurement and the comparison of total growth per unit time is called the absolute growth rate. (ii) The growth of the given system per unit time expressed on a common basis, e.g., per unit initial parameter, is called the relative growth rate.
Here, absolute growth of leaf A to A’ is 2.5 cm2, whereas that of leaf B to B’ is 10cm2. Hence, absolute growth is different. Since 2.5 is 25% of 10, there is a total 25% increase in growth in leaf A, and in leaf B, 10 is 25% of 40, so there is also 25% increase in growth. Hence, the relative growth of two leaves is the same, that is 25%.
Here, absolute growth of leaf A to A’ is 2.5 cm2, whereas that of leaf B to B’ is 10cm2. Hence, absolute growth is different. Since 2.5 is 25% of 10, there is a total 25% increase in growth in leaf A, and in leaf B, 10 is 25% of 40, so there is also 25% increase in growth. Hence, the relative growth of two leaves is the same, that is 25%.
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